Effect of temperature on stress corrosion cracking of 316 L stainless steel in high-temperature water
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摘要: 在高溫水環境中,采用慢應變速率拉伸實驗方法研究了溫度對316 L不銹鋼應力腐蝕開裂的影響規律,并通過掃描電鏡(SEM)對試樣斷口形貌進行分析.結果表明:在高溫水環境中,溫度為200~345℃時316 L不銹鋼具有應力腐蝕開裂敏感性;材料脆性指標隨溫度升高而增大,應力腐蝕開裂敏感性增強,斷口分析與之吻合;250℃是316 L不銹鋼發生應力腐蝕開裂的敏感溫度,斷口邊緣形貌呈現明顯脆性斷裂特征.Abstract: The effect of temperature on stress corrosion cracking (SCC) of 316L stainless steel in high-temperature water was investigated using slow strain rate tests. The fracture morphology of 316 L stainless steel SCC specimens were analyzed with the aid of SEM. The strain-stress results showed that 316 L stainless steel exhibited SCC sensitivity in high-temperature water from 200℃to 345℃, and its brittlement increased with increase temperature, indicating that the SCC sensitivity of 316 L stainless steel was raised. The fractography analysis results also proved this susceptibility clearly. The SCC sensitive temperature of 316 L stainless steel is 250℃, at which the edge fractography morphology of the specimens presented brittle fracture characteristics.
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Key words:
- 316 L stainless steel /
- stress corrosion cracking /
- fractography /
- high-temperature water
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